Filter shaping using a signal cancellation function
US8380771B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2009 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Dec 13, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2011/0488
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A signal filter and accompanying methods. In one embodiment, the filter includes a first mechanism for receiving a first signal. A second mechanism employs one or more modified representations of the first signal to cancel one or more frequency components of the first signal, yielding an output signal in response thereto. In a more specific embodiment, the first mechanism includes a splitter for receiving the first signal and splitting the first signal onto a first path and a second path. The second mechanism further includes one or more delay modules and one or more phase shifters in the first path and/or the second path. One or more controllable amplifiers are optionally included in the first path and/or the second path. The one or more delay modules, phase shifters, or amplifiers are responsive to one or more control signals from a controller. The controller is adapted to modify behavior of the second mechanism so that the filter is characterized by a desired frequency response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.